Lately, I've been pitching starters anywhere between 2-3 qts in size using White Labs vials with great results and super fast fermentations!!!

This week I brewed Monday afternoon and pitched the starter late Monday night. I took a gravity reading today as I saw no bubbles (they must have stopped overnight)...and it's done! By my count, that's almost 4 days total.

My beers have been good, but I'm wondering if I'm missing out on BETTER beer by overpitching.

Have you checked out the pitching calculator at mrmalty.com? 2-3 quarts doesn't sound like overpitching to me. Depending on your starting gravities and the type of beer you're making, 2-3 quarts could be the recommended pitching rate.

Yes...I harvested from my primary, washed, and made a starter. The starter was spewing out of the airlock (approx 3 qts in 1 gal glass jug) within about an hour of pitching and aerating...it was a first, I was amazed!!!

Also, thanks for directing me to mrmalty.com...answered lots of questions and explained alot of observed behaviors in regards to yeast.